Yo-kai Watch 4++ (PuraPura) on the Nintendo Switch (JPN), users can access the and latest (Version 2.2.0) through the official Nintendo eShop
The specific string of terms you provided relates to the Japanese release of the game and its downloadable content (DLC). Core Game Information Version (++ / Pura Pura):
If you are drafting a paper on this topic (e.g., a guide or an analysis of the game's release), consider this structure: Introduction : Overview of Yo-kai Watch 4 and its transition to the (++) version. Release History yokai watch 4 purapura switch nsp jpn dlc up link
Yo-kai Watch 4 was a visual spectacle that showed what the franchise could look like on current-gen hardware. While news on the series has been quiet lately, the Purapura Switch version stands as the definitive way to play this specific chapter.
Conclusion
In December 2019, Level-5 released a massive updated version titled Yo-kai Watch 4++. This included:
Yo-kai Watch 4: Purari no Hoshi is the fourth mainline entry in Level-5’s beloved Yo-kai Watch series, released exclusively in Japan (December 2019). The “++” version (released December 2020) is a major upgrade, including all DLC, additional Yo-kai, and gameplay refinements. Yo-kai Watch 4++ (PuraPura) on the Nintendo Switch
Whether you are a long-time fan wanting to see how the story continues or a newcomer curious about the combat shift to real-time action, the Japanese release remains a cult classic.